diff --git a/README.md b/README.md
index 78042a2..74df7c9 100644
--- a/README.md
+++ b/README.md
@@ -201,7 +201,7 @@ Joseph Fourier’s development of Fourier analysis allowed quantum mechanics to
    [Where]():  
    - $\large \color{DeepSkyBlue} f(x)$ is the original function in the spatial domain.  
    - $\large \color{DeepSkyBlue} \hat{f}(k)$ is the transformed function in the frequency domain.  
-   - $\large \color{DeepSkyBlue} \( x \)$ represents position, and $\large \color{DeepSkyBlue} k$ represents momentum or frequency.
+   - $\large \color{DeepSkyBlue} \ x \$ represents position, and $\large \color{DeepSkyBlue} k$ represents momentum or frequency.
 
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